His call to give gay people equality 'under the law' intensifies supporters' optimism that the White House will argue for same-sex marriage before the Supreme Court.

WASHINGTON — By equating the gay rights struggle with those of African Americans and women, President Obama in his inaugural address set a standard that boosted gay activists' hopes that he soon would make a bold legal move to support a constitutional right to gay marriage.

Obama's words themselves were a landmark — the first time gay rights had ever been advocated in the high-profile speech. But the president, speaking just feet from Supreme Court justices who will take up the issue of gay marriage this spring, went far beyond a simple mention. He equated gay rights with the country's iconic civil rights movements.

"We, the people, declare today that the most evident of truths — that all of us are created equal — is the star that guides us still; just as it guided our forebears through Seneca Falls, and Selma, and Stonewall," he said, linking the beginning of the women's suffrage movement, the battle for black rights in the South and the gay protest against police harassment in New York as equal steps in the nation's march toward equality.

"Our journey is not complete until our gay brothers and sisters are treated like anyone else under the law," he continued, "for if we are truly created equal, then surely the love we commit to one another must be equal as well."

The passage "was definitely one of those moments that took your breath away," said Adam DeRosa, president of the Lesbian and Gay Band Assn., whose 215 members later marched past the president in the inaugural parade. "We understand the historical significance of it. What political significance it has remains to be seen."

Obama, who only last spring hesitated to declare his public support for gay marriage, soon will have to decide whether his administration will take the potentially huge step of arguing before the Supreme Court that gay marriage is an equal right under the Constitution.

The court will soon review two cases, one of them involving California's Proposition 8, the ballot measure that limited marriage to unions between a man and a woman. Gay rights lawyers have asked the Supreme Court to declare the ballot measure unconstitutional, potentially striking down the laws of 41 states.

To several legal scholars, Obama's equating of Selma and Stonewall strongly implied he is prepared to side with gay rights activists. But doing so would mark a sudden departure from the caution with which he has typically approached most issues.

Asked whether the speech was intended to send a signal about the Supreme Court case, a White House official, speaking on condition of anonymity to discuss internal deliberations, said, "It's a legitimate question, but for today, we're letting the president's speech stand on its own."

Theodore Olson, the former George W. Bush administration solicitor general and lawyer for the gay couples challenging Proposition 8, said the president sounded ready to back a constitutional right to gay marriage.

"I was very gratified to hear the president state in clear and unambiguous language that our gay and lesbian citizens must be treated equally under the law," Olson said, "and that their loving relationships must be treated equally as well. That can only mean one thing: equality under the Constitution."

Evan Wolfson, president and founder of New York-based Freedom to Marry, noted in an interview that Obama's speech "was an inaugural address, not a legal brief, and we will see over the next several weeks exactly what positions the Justice Department takes."

"I am confident the president knows that the Constitution requires equality in the freedom to marry," he added.

The excitement that Obama's remarks spurred among advocates of gay marriage was matched by dismay among its opponents. Byron Babione, senior counsel at Alliance Defending Freedom, which is co-counsel in the Proposition 8 case now before the Supreme Court, said it was "deeply dishonest to equate the civil rights movement to today's homosexual activism."

"Civil rights marchers were met with batons, fire hoses, tear gas and nooses. So-called pride parades are met with Fortune 500 corporate sponsorship," he said. "African Americans were systematically dehumanized, while homosexual activists are lionized by every powerful cultural institution and center of wealth in America."

For most of his political career, Obama has supported gay rights but said he opposed same-sex marriage. In May, the president announced that he had "evolved" on the issue and that he now personally supported gay marriage. But he also said the matter should be decided on a state-by-state basis.

Public opinion on the matter has shifted starkly in recent years. An NBC News/Wall Street Journal Poll conducted Dec. 6-9 found that 51% favored or strongly favored gay marriage, with 40% opposed. In 2004, the same poll found 30% in favor and 61% against.